Structure of the 4:1 complexes formed by pyridine and the Group III halides InCl3 and TlCl3: mer-trichlorotris(pyridine)indium(III)–pyridine (1/1), [InCl3(C5H5N)3].C5H5N,and mer-trichlorotris(pyridine)thallium(III)–pyridine (1/1), [TlCl3(C5H5N)3].C5H5N |